Particle size classification device for field use



FIG. 1 is a perspective transparent view of the device of my new design;

FIG. 2 is a front view of the device showing the layers;

FIG. 3 is a top view, thereof; and,

FIG. 4 is bottom view of the device. 

CLAIM The ornamental design for a particle size classification device for field use, as shown and described. 